Caln Meeting House near Coatesville, Pennsylvania, is a historic Quaker meeting house built in 1726 as a one-story tan fieldstone structure and enlarged in 1801 to its present form. Recognized on the National Register of Historic Places in 1984, it also serves partly as a museum. The Old Caln Historical Society uses one third of the building for local history exhibits and for archives, artifacts, and memorabilia, opening it occasionally for museum events. Graveyards stand at the building’s north end and across Pennsylvania Route 340.